Update tengo vendor and load the stdlib. Fixes #789 (#792)

vendor/github.com/d5/tengo/compiler/bytecode.go

@@ -17,32 +17,6 @@ type Bytecode struct {
 	Constants    []objects.Object
 }
 
-// Decode reads Bytecode data from the reader.
-func (b *Bytecode) Decode(r io.Reader) error {
-	dec := gob.NewDecoder(r)
-
-	if err := dec.Decode(&b.FileSet); err != nil {
-		return err
-	}
-	// TODO: files in b.FileSet.File does not have their 'set' field properly set to b.FileSet
-	// as it's private field and not serialized by gob encoder/decoder.
-
-	if err := dec.Decode(&b.MainFunction); err != nil {
-		return err
-	}
-
-	if err := dec.Decode(&b.Constants); err != nil {
-		return err
-	}
-
-	// replace Bool and Undefined with known value
-	for i, v := range b.Constants {
-		b.Constants[i] = cleanupObjects(v)
-	}
-
-	return nil
-}
-
 // Encode writes Bytecode data to the writer.
 func (b *Bytecode) Encode(w io.Writer) error {
 	enc := gob.NewEncoder(w)
@@ -59,6 +33,17 @@ func (b *Bytecode) Encode(w io.Writer) error {
 	return enc.Encode(b.Constants)
 }
 
+// CountObjects returns the number of objects found in Constants.
+func (b *Bytecode) CountObjects() int {
+	n := 0
+
+	for _, c := range b.Constants {
+		n += objects.CountObjects(c)
+	}
+
+	return n
+}
+
 // FormatInstructions returns human readable string representations of
 // compiled instructions.
 func (b *Bytecode) FormatInstructions() []string {
@@ -83,51 +68,22 @@ func (b *Bytecode) FormatConstants() (output []string) {
 	return
 }
 
-func cleanupObjects(o objects.Object) objects.Object {
-	switch o := o.(type) {
-	case *objects.Bool:
-		if o.IsFalsy() {
-			return objects.FalseValue
-		}
-		return objects.TrueValue
-	case *objects.Undefined:
-		return objects.UndefinedValue
-	case *objects.Array:
-		for i, v := range o.Value {
-			o.Value[i] = cleanupObjects(v)
-		}
-	case *objects.Map:
-		for k, v := range o.Value {
-			o.Value[k] = cleanupObjects(v)
-		}
-	}
-
-	return o
-}
-
 func init() {
 	gob.Register(&source.FileSet{})
 	gob.Register(&source.File{})
 	gob.Register(&objects.Array{})
-	gob.Register(&objects.ArrayIterator{})
 	gob.Register(&objects.Bool{})
-	gob.Register(&objects.Break{})
-	gob.Register(&objects.BuiltinFunction{})
 	gob.Register(&objects.Bytes{})
 	gob.Register(&objects.Char{})
 	gob.Register(&objects.Closure{})
 	gob.Register(&objects.CompiledFunction{})
-	gob.Register(&objects.Continue{})
 	gob.Register(&objects.Error{})
 	gob.Register(&objects.Float{})
 	gob.Register(&objects.ImmutableArray{})
 	gob.Register(&objects.ImmutableMap{})
 	gob.Register(&objects.Int{})
 	gob.Register(&objects.Map{})
-	gob.Register(&objects.MapIterator{})
-	gob.Register(&objects.ReturnValue{})
 	gob.Register(&objects.String{})
-	gob.Register(&objects.StringIterator{})
 	gob.Register(&objects.Time{})
 	gob.Register(&objects.Undefined{})
 	gob.Register(&objects.UserFunction{})